deflection testing

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Microsoft PowerPoint - Deflection Testing_marketing1.ppt [Compatibility Mode]Reuben Williams, P.E.
November 15, 2011
Static devices Dynamic devices
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1.1. Apply axial loadApply axial load 2.2. Measure axial Measure axial
deformationdeformation 3.3. Compute Modulus Compute Modulus
“E” “E”
δσ / =E
1.1. Apply FWD loadApply FWD load 2.2. Measure Surface Measure Surface
deflectiondeflection 3.3. Compute ModulusCompute Modulus
- 8 -
il s )
0 2000 4000 6000 8000 10000 12000 14000 16000 18000
Station (feet)
Sensor 1 Sensor 2 Sensor 3 Sensor 4 Sensor 5 Sensor 6 Sensor 7
- 10 -
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Determine LTE Identify Voids
Plot Deflection Profile Plot the deflection under the load plate against the
measured load.
16 kip Load
Station (feet)
D e
fl e
c ti
o n
)
Sensor 1 Sensor 2 Sensor 3 Sensor 4 Sensor 5 Sensor 6 Sensor 7
- 16 -
16 kip Load
Station (feet)
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050100150200250300350400450500550
0
50
100
150
- 18 -
Price Cost
Traffic Control 3 days $1000/day $3,000.00
Destructive Testing
Moisture
Total $16,600.00
Price Cost
FWD Testing 8 hours $250/hour $2,000
Traffic Control 2 days $1000/day $2,000 Cores/Bores 8 samples 300 $2,400
Atterberg 8 tests $ 55/test $440
NDT and Destructive Testing - 3 lane miles, 158 data points
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Moisture
Analysis of
Total $8,200
3,000 2.77 5.80 8.08
5,000 2.28 4.92 6.97
7,000 1.99 4.39 6.31
SN RequirementsSubgrade
Modulus, psi
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5,000 1.11 2.00 2.52
7,000 1.77 3.20 4.02
50,000 ESALs 5,000,000 ESALs 50,000,000 ESALs
5,000 15,244 27,378 34,533
7,000 24,267 43,867 55,067
Modulus, psi
Load Application
Material Characterization
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Simulates Response of Moving Wheel
In Situ response of pavement layersIn Situ response of pavement layers
Better coverageBetter coverage
Reduced evaluation costs Reduced evaluation costs
Reduced construction costsReduced construction costs
- 25 -
Summary